Improvement of Power Efficiency in Phosphorescent  White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer

<table>(a) Current density-voltage (<svg height="13.6375" id="M14" style="vertical-align:-1.97925pt" version="1.1" viewbox="0 0 7.8874998 13.6375" width="7.8874998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><path d="M434 650l-5 -28q-60 -8 -75 -20.5t-25 -69.5l-71 -395q-20 -107 -57.5 -168t-106.5 -94q-40 -18 -61 -20l-10 32q77 23 113 108q21 50 41 160l68 377q10 57 -1.5 69.5t-76.5 20.5l6 28h261z" id="x1D43D"></path></g>
</svg>-<svg height="11.375" id="M15" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 12.7375 11.375" width="12.7375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><path d="M730 650l-8 -28q-52 -4 -72 -18t-64 -77q-79 -113 -321 -539h-33l-119 541q-13 59 -29.5 73t-66.5 20l7 28h245l-8 -28l-28 -5q-33 -6 -40.5 -15.5t-0.5 -38.5l102 -450h2q191 320 246 430q21 42 15.5 56t-43.5 19l-31 4l7 28h240z" id="x1D449"></path></g>
</svg>) characteristics of the hole-only devices with different MoO<sub>3</sub> concentrations (solid line: without MoO<sub>3</sub> (5 nm) layer in both electrodes; dashed line: with MoO<sub>3</sub> (5 nm) layer in both electrodes); (b) electrical conductivities of MoO<sub>3</sub>-doped TAPC films with different doping concentrations.</table>

International Journal of Photoenergy

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Figure 2

Figure 2: Improvement of Power Efficiency in Phosphorescent  White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer 